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hll_raw_agg

Description​

This function is an aggregate function that is used to aggregate HLL fields. It returns an HLL value.

Syntax​

hll_raw_agg(hll)

Parameters​

hll: the HLL column that is generated by other columns or based on the loaded data.

Return value​

Returns a value of the HLL type.

Examples​

mysql> select k1, hll_cardinality(hll_raw_agg(v1)) from tbl group by k1;
+------+----------------------------------+
| k1   | hll_cardinality(hll_raw_agg(`v1`)) |
+------+----------------------------------+
|    2 |                                4 |
|    1 |                                3 |
+------+----------------------------------+